How do i make a brick wall?
The quality of the PBR material that you are using is quite poor if the image you uploaded is what you're using. I would try something along these lines:



These were found on the popular site Poliigon.
You can probably get away with only using the normal maps and displacement.
As far as unwrapping, I'm not sure what you have to unwrap exactly. It's a wall... just unwrap it like you would any other rectangular object and try to hide seams where possible.